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On the number line, \(P=\sqrt{2}\) and \(Q=\sqrt{3}\). A student says that no rational number can lie between \(P\) and \(Q\) because both endpoints are irrational. What is the correct evaluation of this statement?

Answer and explanation

Correct answer: The statement is incorrect because infinitely many rational numbers lie between \(P\) and \(Q\).

Since \(2<\left(\frac{3}{2}\right)^2=\frac94<3\), we get \(\sqrt2<\frac32<\sqrt3\). Thus \(\frac32\) is a rational number between them; in fact, infinitely many rationals lie between distinct real numbers. Exam tip: compare positive roots by squaring.

Related tags

Number LineRational NumbersIrrational NumbersDensity Of RationalsSquare RootsNumber SystemsMathematicsClass 9 Mcq

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